package com.heima.app.gateway.filter;
import com.heima.my.constant.GlobalConstant;
import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.function.Consumer;

@Component
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        if(request.getURI().getPath().contains(GlobalConstant.LOGIN_TAG))
        {
            return chain.filter(exchange);
        }
        String token = request.getHeaders().getFirst(GlobalConstant.TOKEN_NAME);
        if(StringUtils.isBlank(token))
        {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        try{
            Claims claims = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claims);
            if(result==1||result==2)
            {
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            Object userId = claims.get(GlobalConstant.ID_TAG);
            ServerHttpRequest newRequest = request.mutate().headers(new Consumer<HttpHeaders>() {
                @Override
                public void accept(HttpHeaders httpHeaders) {
                    httpHeaders.add(GlobalConstant.USER_ID_TAG, userId + "");
                }
            }).build();
            exchange.mutate().request(newRequest);
        }catch (Exception e){
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return -1;
    }
}
